Using SIP REFER for Efficient Call Handling on PBX/Twilio

[ltstech]

I'm exploring options for using SIP REFER or a call transfer feature at the trunk level with Twilio or a PBX. Currently, forwarding calls is costly because both the inbound and outbound legs of the call remain active until the call ends. Ideally, I'd like to set up a blind transfer or configure the trunk to hand off the call, eliminating the need to retain both legs for the duration of the call. Has anyone implemented this or have recommendations on how to achieve it efficiently?